XLS to XLSX Online
Free XLS to XLSX converter — no signup, no watermark. Upload your file and download the result in seconds. Files are deleted automatically after conversion.
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Up to 150 MB per file · 1 file at a time · 200+ formats
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Output
From
XLS
— Microsoft Excel 97-2003XLS is the legacy Microsoft Excel format. Still widely used for compatibility with older systems and applications.
All XLS conversions
To
XLSX
— Microsoft Excel Open XMLXLSX is the modern Microsoft Excel format for spreadsheets, data analysis, and financial models. Compatible with Excel, Google Sheets, and LibreOffice Calc.
All XLSX conversions